Question 548787
9m^3=81m
move terms to one side:
9m^3 - 81m = 0
factor left:
9m(m^2 - 9) = 0
9m(m^2 - 3^2) = 0
9m(m-3)(m+3) = 0
solution:
m = {-3, 0, 3}